There you go! now we have enough information to try to help
As the topic in the FAQ explains, you must add the proper mime type into upload_definitions.php
Sometimes one mime type is not enough due to many possible variants dependend on the file format. Usualy the "missing" mime type could be found in the error message when uploading file.
In your case:
02-09-05_1303.3gp: Die Datei hat ein ungültiges Format (3gp, )
its little tricky, because it shows "empty" mime type, so the the final entry in upload_definitions.php for this extension should be:
$mime_type_match['3gp'] = array("video/quicktime", "", " ");
(just in case I added third mime type as a space, probably you dont even need it).
P.S. I'll update FAQ topic with info about this kind of "tricky" mime type.